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- Olcott, Alison N.; Sessions, Alex L.; Corsetti, Frank A.; Kaufman, Alan J.; Oliviera, Tolentino Flavio de
- Science 2005 v.310 no.5747 pp. 471-474
- biomarkers; carbon; eukaryotic cells; euphotic zone; glaciation; ice; latitude; microbial ecology; photosynthesis; photosynthetic bacteria; primary productivity; rocks; surface water; Brazil
- ... Laterally extensive black shales were deposited on the São Francisco craton in southeastern Brazil during low-latitude Neoproterozoic glaciation [approximately]740 to 700 million years ago. These rocks contain up to 3.0 weight % organic carbon, which we interpret as representing the preserved record of abundant marine primary productivity from glacial times. Extractable biomarkers reflect a compl ...
- Alley, Richard B.; Clark, Peter U.; Huybrechts, Philippe; Joughin, Ian
- Science 2005 v.310 no.5747 pp. 456-460
- climate change; freshwater; greenhouse gases; ice; melting; models; sea level; uncertainty; Antarctic region; Greenland
- ... Future sea-level rise is an important issue related to the continuing buildup of atmospheric greenhouse gas concentrations. The Greenland and Antarctic ice sheets, with the potential to raise sea level [approximately]70 meters if completely melted, dominate uncertainties in projected sea-level change. Freshwater fluxes from these ice sheets also may affect oceanic circulation, contributing to clim ...